Colbert Busch, Sanford Race Is Down to the Wire

The unlikely candidate Elizabeth Colbert Busch, comedian Stephen Colbert's sister, is in a dead heat with former South Carolina Gov. Mark Sanford in Tuesday's special election for a U.S. House seat.

Just weeks ago, Mr. Sanford, the Republican candidate, was on track to walk away with the election for the Charleston-based seat, despite leaving the governor's mansion in disgrace two years ago. Ms. Colbert Busch was considered a long shot against Mr. Sanford, who had held the same House seat before becoming governor, and...